The secret life of the cat
Watch over 200 Horizon clips
Horizon has covered some of the most important scientific issues of recent decades, and this extensive back catalogue has over 200 short clips from as far back as the late Sixties.
Video quiz: Is seeing believing?
See if your senses are fooled by some of the cleverest optical illusions ever created, and find out how they work. As well as being fun, they’re also helping scientists learn more about how we interpret the world around us.